Stone polisher



Feb. 1B, 1927;

1,617,578 0. s. CUSHMAN STONE POLISHER Filed June 2, 1925 2 Sheets-Sheet1 .C. S. C USHMAN Feb. 15,1921. 1,617,578"

7 STONE POLISHER Filed June 2, 1925 2 sheet -sheet:

Patented Feb. 15, 1927.

entree stares;

CHARLES S. CUSHMAN, OF BARRE, VERMONT.

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s'ronn ron'rsninn.

Application filed June 2, 1925. Serial No. 34,459.

This invention relates to new and useful improvements "in stonepolishing devices, and particularly to rotary polishing devices.

The present application embodies improvements on my prior Patent1,491,790, issued April 29, 1924, and my pending application SerialNumber 737,116.

One improvement resides in the provision of novel means for moving thepolishing element longitudinally of the surface of the governing of oneby the other.

Other objects and advantages will be-apparent from'the followingdescription when taken in connection with the accompanying drawings.

In the drawings:

Figure 1 is an elevation of the device in operative position withrelation to a stone to be polished. I

Figure 2 is an elevation looking toward the left side of Figure 1,partly broken away.

Figure 3 is a top plan view of the same.-

Referring particularly'to the accompanying drawing, 10 and 11 representsa pair of parallel I-beams, properly supported and held in spacedrelation. Disposed beneath these beams 10. and 11 is a carriage 13,which is supported from the lower flanges of said beams by the wheels12. Extending upwardly from the carriage is an arm 15, on which aremounted the trolley wheels 13,

' and which engage with the trolley wires 14, which are supported inparallel relation to,

and adjacent one of the said beams. On the carriage 13 is mounted anelectric motor 16, the shaft 17 of which is provided with a gear 18meshing with a gear 19, on a counter-shaft 20, arranged adjacentthereto. On the other end of the counter-shaft 20 is formed a worm 21which meshes with a worm wheel 22 carried by the upper portion of thevertical shaft 23, which is mounted on the carriage, at.14. On the shaft23, above the worm wheel .22, are mountedfthe winding drums 24 and '25,and connected to these drums, and wound thereon in opposite directions,are the cables 26 and 27 the other ends of the cables being suitablyanchored,

or securedadjacent the ends of the beams '10 and '11. Swiveled on thelower end of the shaft 23, below the carriage, is an L-shaped member 28,and carried by the horivzontal arm of said member is a horizontallyextending arm 29, provided with a terminal stop collar 30. Enga'ged onthis arm, for slidable movement longitudinally thereof, is a strap 31,which is connected with the hori-' zontal bar 32. Connected tofanddepending from the'ends of these bars 32-are the cables 33, the lowerends'of which are connected to the ends of similar bar 34', whoseintermediate portions are swivelly' connected to the upper end of thelug 35, of the casing of the motor 36, of'the stone polishing element 37Connected to and extending between the cables 33, are the spacing bars38, which serves to prevent twisting and tangling of the cables, duringthe operation of the machine- On the vertical shaft 23, between thelower and of the carriage 13, and the member 28, are the collector rings39, which are e11- gaged by the brushes 40, carried'by the said whichelectric current is conveyed to the motor 36, of the'stone polishingelement 37, electric conduits 41 beingprovided for conveyi'ng currentfrom the trolley wheels 13 to the collector rings 39, and other conduits42 being provided for conveying current from the trolley wheels to themotor 16.

' Upon starting'the motor 36, the polishing element 37 will be rotatedon the surface of the stone,'in an axial direction, whereupon the'bars34 will be'swung around with the result that a'twisting movement will beimparted to the cables 33, and transmitted to the upper bars 32, toexert a turning IIIOVQ'.

face of the stone. Thus the polishing element turns about its axis, andat the same time turns 111 an orbital path, which 1s cirmember 28, andthrough the medium of i cular, with the resultthat tliepolishing elementwill travel circularly and transversely of the surface of the stone.

I Before starting the machine, the-cable-26is securedat its outer end toa stationary element, not shown, whereby, as the motor 16 rotates this Icable will be wound on "the drum to draw v stone.

the carriage,-and the parts connected therewith, longitudinally of thestone to be h polished,- the other cableibeing loose. When thepolishingelement has reached the end of thestone, the cable 26 (is-loosened, andthe cable 27 secured to a stationary element,

whereupon the .saidcable 27 will be wound "on itsdrum, and the carriage,and associthe; switches; and the cable ends Ifdesired, ;the motor 16 may.be driven i-n a direction opposite to that in which the polishingelement lIIlpBlS the shaft 23, by reversing-the electric current whichflows to the said mot0r.-

What is claimed is: 1. A'pol shing devlcecomprising, in combination withan'elevatedsupporfl of amoto'r drivenpolishing elemeht,,m-eans betweenthe support and; said;polishingielement adapted to suspen lgthelatterwhile operable tolperunit the weight of theeleme nt to rest upon surfaceto herpolished said suspending ,means being adapted totwistupon reactionof the motorto the resistance resulting from 'ithe frictional contact ofsaid element with "thesurfacetobe polished, whereby to tend to elevatesaid element into proper: polishing contactual pressure against saidsurface, and means associated .witlrthej suspendlng means for drivingthe polishing element in an .orbital direction.

v ,2. A polishing device comprising the combination with an elevatedsupport, of amotor driven polish ng element, {L'flGXlblG twistablesuspending.means between the support and the motor driven element, saidfixible'element "being adapted to be twisted by the motor of-theelcmentdue to the resistance offered'by the surface tobe polished to thepolishing element, whereby said element will be raised from the surfaceto be polished to a su'flicient degree to reduce the frictional contactbetweenthe surface and said element and said element permitted torotate, and

means associated with the suspending means for turningethe polishingelement orbltally.

3. A polis'hing device comprising the combination withanelevated track,vof a motor driven polishing element, a flexible suspending means betweenthe track andielement whereby said element is capableof movement to bepositioned with reference to the surface to be polished, said flexiblesuspending means being adapted to be @twiste'd bythe motorof the motordriven element dueto the resistance offered by the surface 'to' bepolished .to the polishing element, whereby saidv element, will beraised from said surface to a suflicient degree to reducethe frictionalcontact betweensaid surface and said element and said element permittedto rotate on said surface, and independently driven means connected withthe suspending means for driving'the elementorbitally on the surface tobe polished.

4. A polishing devicecomprising thecombinationwithan elevated support,offla polishing element including a driving motor,

and flexible means supporting the olishin element from the elevatedsupport and jop'erable by;the reaction of the motorito the resistance tothe rotation-of the polishing element offered byithe sur-faceito 'bepolished whereby to lessen the pressuiebetw'een the polishing elementand the surface tolbepolished, means associated with the jflezkible[means for moving the polishingelement 1011- V gitudinally of thesurface to be polished, and means associatedwith theflexible means fordriving the polishing element orbitallv 5. In a polishing device; arotatable polishing elementnormally resting with itsfull weight on thesurfacefto be polished, means for rotating said element, and flexiblesuspending means for said element arranged to'betwisted by said drivingmeans when'the latter is initially set in'motion whereby to tendtoelevate the element to a degree sufiicient to produce the properpolishing con- .tactual relation between the element and the surface tobe polished, and means actuated by the rotatingmeans for movingthepolishi1 1g element orbit'ally on the surface.

In-testimony whereof I affix m signature.-

CHARLES S. CU .HMANL

